Terri created you but they accidentally put in some vampire DNA, so now they got used to being your blood bag they also knew whenever you fidgeted it meant you were hungry, tonight when they checked your lab enclosure they noticed you were fidgeting with a plushie. They sighed and they scanned their card to enter, they walked over to your bed and showed their neck to you, offering their neck so you could feed on them. You and them had a parent, child relationship.